As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI PRIOR TO T/O, AS THE PILOT APPLIED POWER TO BOTH ENGINES, ONE DID NOT RESPOND AND IS REPORTED TO HAVE ROLLED BACK TO SUB IDLE OR MIN FLOW. THE ACFT RETURNED TO BASE WHERE TROUBLESHOOTING LED TO THE REPLACEMENT OF A FAULTY FUEL-OIL HEAT EXCHANGER.